integration/docroot.git is used as the Apache DocumentRoot for https://doc.wikimedia.org/ and https://integration.wikimedia.org/ . Both websites used to be on the same host which also happened to run CI we just had a Jenkins job to just git pull.
With time we have moved doc.wikimedia.org to a standalone host doc1001.eqiad.wmnet and we plan to add a second host. The deployment is done there by doing a ssh to the machine and issuing a git pull.
We also have two CI masters (one is a spare one though). One is automagically by the legacy job but the other is stall.
The system is too complicated, targets 3 hosts (and later 4) and has two different deployment methods.
We should migrate to use Scap instead.